Accounting For Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual dividend yield			1.40%
Weighted average fair value for options granted, per share			$ 11.60	$ 8.33
Pre-tax stock-based compensation expense	$ 4.7	$ 4.1	$ 6.1	$ 5.5
Tax benefit associated with stock options	1.6	1.4	2.0	1.8
Total intrinsic value of options exercised			15.9	24.5
Aggregate intrinsic value of options outstanding	110.2		110.2
Aggregate intrinsic value of options exercisable	103.8		103.8
2010 Master Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to non-vested stock options granted	$ 11.2		$ 11.2
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life			6 years
Expected volatility			25.10%
Risk-free interest rate			1.81%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life			8 years
Expected volatility			28.00%
Risk-free interest rate			2.83%